#include <stdio.h>
#include <ctype.h>


int main(int argc,char **argv)
{
  int c1;
  /*
  c1 = 'a';
  printf("%c:%s\n",c1,isalnum(c1)?"yes":"no");
  c1 = '7';
  printf("%c:%s\n",c1,isalnum(c1)?"yes":"no");
  c1 = '@';
  printf("%c:%s\n",c1,isalnum(c1)?"yes":"no");
  return 0;*/

  
}
